Tire bench testing method and tire bench testing system

Abstract

The present invention provides a tire bench test method and a tire bench test system, and relates to the technical field of vehicle bench test. The present invention first places the tire on a test drum device, and makes the impact strip on the rim of the test drum device contact the tire, then respectively operates the rim at multiple preset speeds, and collects mechanical data of the tire at multiple preset speeds, and then respectively performs time windowing processing on the mechanical data at multiple preset speeds to obtain time windows at multiple preset speeds, and finally calculates the mechanical data, time and current speed of the rim of each time window period to obtain the total energy value at multiple preset speeds, so as to determine the performance of the tire at different preset speeds according to the total energy value. The above technical scheme performs time windowing processing on the mechanical data, which can accurately extract objective mechanical data and improve the matching degree with the subjective feelings of the test personnel.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle bench testing, and in particular to a tire bench testing method and a tire bench testing system. Background Art

[0002] Tires are the only key components that touch the ground when a vehicle is driving. Under a certain mechanical transmission path, the road excitation and the vibration effect of the tire spring oscillator are amplified, causing poor vehicle ride comfort and severe high-speed vibration, which in turn causes consumer complaints.

[0003] The traditional technical solution does not provide a comprehensive analysis of the tire's mechanical data, which can lead to a low degree of match between the test bench's objective data and the subjective feelings of the testers. Summary of the invention

[0004] The first aspect of the present invention aims to provide a tire bench test method to solve the technical problem in the prior art that the matching degree between the objective data of the bench and the subjective feelings of the testers is low.

[0005] A second aspect of the present invention is to provide a tire bench testing system.

[0006] According to the purpose of the first aspect of the present invention, the present invention also provides a tire bench testing method, comprising:

[0007] Placing the tire on a test drum device so that the impact bar on the rim of the test drum device contacts the tire;

[0008] Operating the wheel rim at a plurality of preset rotational speeds respectively, and collecting mechanical data of the tire at the plurality of preset rotational speeds;

[0009] Performing time windowing processing on the mechanical data at multiple preset speeds respectively to obtain time window periods at multiple preset speeds;

[0010] The mechanical data, time and current rotation speed of the rim in each time window are calculated to obtain total energy values ​​at multiple preset rotation speeds, so as to determine the performance of the tire at different preset rotation speeds according to the total energy values.

[0011] Optionally, the step of calculating the mechanical data, time and the current rotation speed of the rim in each time window period to obtain the total energy value at a plurality of preset rotation speeds specifically comprises the following steps:

[0012] Performing differential calculation according to the mechanical data, time and current rotation speed of the rim in each time window to obtain energy values ​​in each preset time period in each time window;

[0013] The energy value in each preset time period in each time window is integrated and calculated to obtain the total energy value under multiple preset rotation speeds.

[0014] Optionally, the mechanical data, time and current rotation speed of the rim in each time window are calculated to obtain total energy values ​​at multiple preset rotation speeds, and then the following steps are further included:

[0015] Linear regression convergence is performed on the total energy values ​​at multiple preset rotation speeds to predict the total energy values ​​at different speeds.

[0016] Optionally, the positions of the time windows at different preset rotation speeds are different.

[0017] Optionally, the step of performing time windowing processing on the mechanical data at multiple preset speeds to obtain time window periods at multiple preset speeds specifically includes the following steps:

[0018] The time of the first peak of the mechanical data is taken as the beginning of the time window period, and the time after a preset time length is taken as the end of the time window period.

[0019] Optionally, it also includes:

[0020] The absolute maximum value in the mechanical data of the tire at each preset rotation speed is used as the evaluation index value at each preset rotation speed.

[0021] Optionally, the mechanical data of the tire includes mechanical data in an X-axis direction and mechanical data in a Z-axis direction, the X-axis direction is the direction of the intersection of the tire plane and the ground plane, and the Z-axis direction is the direction of the tire perpendicular to the ground plane.

[0022] Optionally, a preset duration of the time window period of the mechanical data in the X-axis direction is greater than a preset duration of the time window period of the mechanical data in the Z-axis direction.

[0023] According to the purpose of the second aspect of the present invention, the present invention also provides a tire bench test system, comprising:

[0024] A control module, the control module includes a memory and a processor, the memory stores a calculation program, and the calculation program is used to implement the above tire bench test method when executed by the processor.

[0025] The present invention first places the tire on a test drum device, and makes the impact strip on the rim of the test drum device contact the tire, then respectively operates the rim at multiple preset speeds, and collects mechanical data of the tire at multiple preset speeds, and then respectively performs time windowing processing on the mechanical data at multiple preset speeds to obtain time windows at multiple preset speeds, and finally calculates the mechanical data, time and current speed of the rim in each time window period to obtain the total energy value at multiple preset speeds, thereby determining the performance of the tire at different preset speeds according to the total energy value. The above technical solution performs time windowing processing on the mechanical data, which can accurately extract objective mechanical data and improve the matching degree with the subjective tester's feelings.

[0026] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0028] Figure 1 is a schematic flow chart of a tire bench testing method according to one embodiment of the present invention;

[0029] Figure 2 is a schematic mechanical data diagram of a tire in the Z-axis direction at different rotation speeds according to an embodiment of the present invention;

[0030] Figure 3 is a schematic flow chart of a tire bench testing method according to another embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of energy values ​​in each preset time period within a time window period according to an embodiment of the present invention;

[0032] Figure 5 is a schematic diagram of linear regression of total energy values ​​of a tire at different speeds and prediction of total energy values ​​at a specified speed according to one embodiment of the present invention;

[0033] Figure 6 FIG. 4 is a schematic connection block diagram of a tire bench test system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] Figure 1 FIG. 1 is a schematic flow chart of a tire bench test method according to an embodiment of the present invention. Figure 1 As shown, in a specific embodiment, the tire bench test method includes the following steps:

[0036] Step S100, placing the tire on a test drum device, and making the impact strip on the rim of the test drum device contact the tire;

[0037] Step S200, the wheel rim is operated at a plurality of preset rotational speeds respectively, and mechanical data of the tire at the plurality of preset rotational speeds are collected; here, the rotation of the wheel rim will drive the tire to rotate.

[0038] Step S300, performing time windowing processing on the mechanical data at multiple preset speeds respectively to obtain time window periods at multiple preset speeds;

[0039] Step S400, calculating the mechanical data, time and current rotation speed of the rim in each time window to obtain total energy values ​​at multiple preset rotation speeds, thereby determining the performance of the tire at different preset rotation speeds according to the total energy values.

[0040] This embodiment performs time windowing processing on the mechanical data, which can accurately extract objective mechanical data and improve the matching degree with the subjective feelings of the testers.

[0041] Specifically, select the tires that the actual vehicle test driver evaluates well or poorly in terms of high-speed vibration and smoothness of the whole vehicle, and take the tire sample at the left front driver's position. The preferred impact strip size is 20*20mm, or 25*25mm, and is placed horizontally on the high-speed uniformity drum. The tire inflation pressure and load are the same as the actual vehicle test state. By default, 1.3 times the standard air pressure and standard load of ETRTO (European Tyre and Rim Technical Organization) can be used. The side of the impact strip close to the tire needs to be chamfered to protect the tire from damage caused by high-intensity cutting.

[0042] In this embodiment, the mechanical data of the tire includes mechanical data in the X-axis direction and mechanical data in the Z-axis direction. The X-axis direction is the intersection direction of the tire plane and the ground plane, and the Z-axis direction is the direction of the tire perpendicular to the ground plane.

[0043] Figure 2 : is a schematic diagram of mechanical data of a tire in the Z-axis direction at different rotation speeds according to an embodiment of the present invention. Figure 2 As shown, in this embodiment, multiple preset speeds can be set to 20km / h, 40km / h, 60km / h, 80km / h, and 100km / h, and the wheel rim is operated at the above speeds for 3 times to obtain an effective single time length of 1.5S. In other embodiments, the preset speed can also be set according to actual needs. The mechanical data of the tire is collected according to the running time, and the data of channels FZ, FX, FY, MX, MY and MZ are collected every 0.0005s. The longitudinal and radial mechanical signals FX and FZ data of the tire are read from the above channel data. Among them, since FZ is preloaded, it is necessary to subtract the preload FZ' from the FZ data to ensure zeroing in the Z-axis direction.

[0044] Figure 3 FIG. 1 is a schematic flow chart of a tire bench test method according to another embodiment of the present invention. Figure 3 As shown, in another embodiment, step S400 includes the following steps:

[0045] Step S410, performing differential calculation according to the mechanical data, time and current rotation speed of the rim in each time window to obtain the energy value in each preset time period in each time window;

[0046] Step S420, integrating and calculating the energy value in each preset time period in each time window to obtain the total energy value under multiple preset speeds.

[0047] In this embodiment, step S300 specifically further includes the following steps:

[0048] The time of the first peak of the mechanical data is taken as the beginning of the time window period, and the time after the preset time length is taken as the end of the time window period.

[0049] In this embodiment, it is necessary to perform time windowing processing on the oscillation curve, and the preset duration of the time window period of the mechanical data in the X-axis direction is greater than the preset duration of the time window period of the mechanical data in the Z-axis direction. Specifically, the preset duration in the Z-axis direction is 0.25S, and the preset duration in the X-axis direction is 0.3S. The positions of the time windows under different preset speeds are different, and can be specifically started according to the first peak position. For example, the time window period at 20kph is 0.25S to 0.5S in the Z-axis direction, the time window period at 40kph is 0.1S to 0.35S, the time window period at 60kph is 0.05S to 0.3S, and the time window period at 80kph and 100kph is 0-0.25S. Similarly, the X-axis direction is windowed, with a time window of 0.2S to 0.5S at 20kph, 0.1S to 0.4S at 40kph, and 0S to 0.3S at 60kph, 80kph, and 100kph. The time window can be adjusted according to the time, and the width of the time window can be increased or decreased according to the tire specifications. The above is the recommended time window. The data in the non-time window area is discarded and does not participate in the calculation of the total energy value.

[0050] Figure 4 is a schematic diagram of energy values ​​in each preset time period within a time window according to an embodiment of the present invention. Figure 4 As shown in the figure, in each time window, the mechanical data of the channel within 0.0005S is multiplied by the time and the current speed to obtain the differential energy value, and then the total energy value of the time window at the current speed is calculated by integration. This total energy value is used to measure the energy attenuation of the tire after the interference of foreign objects on the road surface, and it matches the tire vibration during the actual vehicle test.

[0051] Figure 5 FIG. 1 is a schematic diagram of the linear regression of the total energy value of a tire at different speeds and the prediction of the total energy value at a specified speed according to an embodiment of the present invention. Figure 5 As shown in the figure, y represents the total energy value, x represents the speed, EZ20 represents the total energy value of the tire in the Z-axis direction at 20 kph, EZ40 represents the total energy value of the tire in the Z-axis direction at 40 kph, and EZ60 represents the total energy value of the tire in the Z-axis direction at 80 kph. In this embodiment, after step S400, the following steps are also included:

[0052] Step S500 , performing linear regression convergence on the total energy values ​​at a plurality of preset rotational speeds to predict the total energy values ​​at different speeds.

[0053] In this embodiment, the tire bench test method further includes the following steps:

[0054] The absolute maximum value in the mechanical data of the tire at each preset speed is used as the evaluation index value at each preset speed. This evaluation index value is used to evaluate the mechanical impact peak of the tire of the moving vehicle when encountering an obstacle, and matches the first-order impact of the subjective driver. All data during the bench test, as well as the evaluation index values ​​and the total energy values ​​at different speeds are automatically entered into the database for design experience accumulation. PYTHON is used for mechanical data collection and post-processing in all the above steps to complete automation and dataization, improve work efficiency, and reduce errors in manual processing.

[0055] Figure 6 FIG. 1 is a schematic connection block diagram of a tire bench test system 100 according to an embodiment of the present invention. Figure 6 As shown, in a specific embodiment, the tire bench test system 100 includes a control module 10, and the control module 10 includes a memory 11 and a processor 12. The memory 11 stores a computing program, and the computing program is used to implement the above-mentioned tire bench test method when executed by the processor 12. The processor 12 can be a central processing unit (CPU for short), or a digital processing unit, etc. The processor 12 sends and receives data through a communication interface. The memory 11 is used to store the program executed by the processor 12. The memory 11 is any medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, and can also be a combination of multiple memories. The above-mentioned computing program can be downloaded from a computer-readable storage medium to a corresponding computing / processing device or downloaded to a computer or an external storage device via a network (such as the Internet, a local area network, a wide area network and / or a wireless network).

[0056] Since the tire provides the vehicle with mechanical properties and energy levels in the forward X-axis direction and the longitudinal Z-axis direction stimulated by the road surface, it is helpful to study how to reduce the smoothness and jitter characteristics of the entire vehicle. This embodiment converts the subjective vibration test of the tire into an objective test on the bench, completes the design error prevention in the development stage, and accurately designs the objective test method, accurately extracts objective data, extracts reasonable indicators for post-processing of the mechanical data, and performs secondary deep mining on the data, using the objective data on the bench to match the subjective tester's feelings. This embodiment innovatively uses PYTHON to process the objective test data on the bench to achieve a self-generated database, reduce test expenses, and improve the repeatability and reproducibility of bench tests and the objectivity of data.

[0057] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A tire bench test method, characterized in that: include: Placing the tire on a test drum device so that the impact bar on the rim of the test drum device contacts the tire; Operating the wheel rim at a plurality of preset rotational speeds respectively, and collecting mechanical data of the tire at the plurality of preset rotational speeds; Performing time windowing processing on the mechanical data at multiple preset speeds respectively to obtain time window periods at multiple preset speeds; Calculating the mechanical data, time and current rotation speed of the rim in each time window to obtain total energy values ​​at multiple preset rotation speeds, thereby determining the performance of the tire at different preset rotation speeds according to the total energy values; The step of calculating the mechanical data, time and the current rotation speed of the rim in each time window to obtain the total energy value at multiple preset rotation speeds specifically includes the following steps: Performing differential calculation according to the mechanical data, time and current rotation speed of the rim in each time window to obtain energy values ​​in each preset time period in each time window; Integrating and calculating the energy value in each preset time period within each time window to obtain the total energy value under multiple preset speeds; The mechanical data of the tire includes mechanical data in the X-axis direction and mechanical data in the Z-axis direction, wherein the X-axis direction is the direction of the intersection of the tire plane and the ground plane, and the Z-axis direction is the direction of the tire perpendicular to the ground plane; The positions of the time windows at different preset speeds are different; The step of performing time windowing processing on the mechanical data at multiple preset speeds to obtain time window periods at multiple preset speeds specifically includes the following steps: The time of the first peak of the mechanical data is taken as the beginning of the time window period, and the time after a preset time length is taken as the end of the time window period.

2. The tire bench testing method according to claim 1, characterized in that: The mechanical data, time and current rotation speed of the rim in each time window are calculated to obtain total energy values ​​at multiple preset rotation speeds, and then the following steps are included: Linear regression convergence is performed on the total energy values ​​at multiple preset rotation speeds to predict the total energy values ​​at different speeds.

3. The tire bench testing method according to claim 1, characterized in that: Also includes: The absolute maximum value in the mechanical data of the tire at each preset rotation speed is used as the evaluation index value at each preset rotation speed.

4. The tire bench testing method according to claim 1, characterized in that: The preset duration of the time window period of the mechanical data in the X-axis direction is greater than the preset duration of the time window period of the mechanical data in the Z-axis direction.

5. A tire bench test system, characterized in that: include: A control module, the control module comprises a memory and a processor, the memory stores a calculation program, and the calculation program is used to implement the tire bench test method according to any one of claims 1 to 4 when executed by the processor.

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